[Xastir] Slow raster map render

[Lynn W. Deffenbaugh (Mr)]

On 9/7/2012 12:07 PM, Tom Hayward wrote:
> Why is Xastir slow to render raster maps?

Because it's doing a LOT of processing.

>   I'm curious what is actually
> happening behind the scenes. It appears that Xastir is re-projecting
> the raster maps, requiring an expensive render.

 From what I've seen in browsing the source code a while back, that 
seems to be the case.

>   Why not just
> re-project the APRS stations and any shapefile overlay to match the
> raster tiles?

Because people want to zoom to any scale they want and not be restricted 
to what the tile set might offer natively.  At least, that's the 
criticism/request I get every now and then from APRSISCE/32 users which 
constrains them to native tile zoom levels.

>   Wouldn't this be much faster?

Yes, and that's why I don't scale the bitmaps, but I'm glad alternative 
platforms offer features in areas where I don't plan to go.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32